Hello erveryone.
Thx for the links and the answers.
I've run into this page. explaining an RC autopilot, called RCAP. It uses a GPS unit onboard the boat. And a microcontroller and an Autopilot module. It's pretty much what i was
looking for.
http://rcpilot.sourceforge.net/modules/rcap/index.php
I've seen this autopilot modules on planes. For controlling tilt and direction (correct me if i'm wrong please). Do you think a boat will need such thing???
Thanks everyone